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Role of nitrogen functional groups and manganese oxides on the reduction of NO over modified semi-coke catalyst at low temperature

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Abstract

Modified semi-coke catalysts loaded melamine (M) and/or manganese oxides (MnOx) were prepared by the impregnation method for the reduction of NO at low temperature. A fixed-bed reactor, XRD, Raman and XPS were used for the catalytic activity measurement and characterization of modified semi-coke catalysts. The highest denitration rate of 5M–10Mn–ASC was 91.6% at 225 °C and kept the highest level within 200–300 °C. The results of characterization revealed the changes of nitrogen functional groups on the surface of modified semi-coke catalysts. Pyrrolic-like nitrogen (N-5) appeared on the surface of semi-coke catalysts only with M. After loading M and MnOx simultaneously, quaternary nitrogen (N–Q) appeared and the contribution of nitro type complexes (–NO2) declined sharply. During the whole reaction process, melamine as a nitrogen species source can adjust both the contribution of acidic and basic functional groups. The acidic functional groups, like C=O and N–Q, could provide active sites to adsorb NH3 and the basic functional groups, like pyridinic-like nitrogen (N-6) and N-5, could adsorb some O2 and NO. Meanwhile, the sufficient oxygen vacancies and surface chemical oxygen provided by MnOx reinforced denitration efficiency of modified semi-coke catalysts as well. Different modified conditions would result in the changing roles of nitrogen functional groups constantly, which could be beneficial to improve the denitration rate. Based on the results of catalytic activity measurements and analysis of different characterization, the possible denitrification mechanism of modified semi-coke catalysts was built.

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Acknowledgements

The authors gratefully acknowledged the National Natural Science Foundation of China (No. 51604048), Fund of Chongqing Science and Technology (No. csct2016shmszx20015) and China Postdoctoral Science Foundation (2017T100683) and Chongqing Postdoctoral Science Foundation (xmT2017002).

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Authors and Affiliations

  1. College of Resources and Environmental Science, Chongqing University, No. 174 Shazhengjie Street, Chongqing, 400044, China

    Lu Yao, Shan Ren, Qingcai Liu, Jie Yang, Lijun Jiang, Chao Fan & Dayong Chen

  2. College of Materials Science and Engineering, Chongqing University, No. 174 Shazhengjie Street, Chongqing, 400044, China

    Shan Ren, Jie Yang & Chao Fan

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  1. Lu Yao
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  2. Shan Ren
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Correspondence to Qingcai Liu.

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Yao, L., Ren, S., Liu, Q. et al. Role of nitrogen functional groups and manganese oxides on the reduction of NO over modified semi-coke catalyst at low temperature. Res Chem Intermed 45, 563–579 (2019). https://doi.org/10.1007/s11164-018-3619-2

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